There are several synonyms for the phrase "mind-blowing numbers." One such synonym is "jaw-dropping figures." This phrase conveys the same sense of amazement and astonishment that "mind-blowing numbers" does. Another possible synonym could be "astounding statistics," which emphasizes the impressive nature of the numbers. Additionally, "staggering totals" could also be used to describe large sums of data. Other potential synonyms could include "eye-opening metrics," "unbelievable amount," or "mind-boggling digits." All of these phrases serve to convey the same sense of awe and incredulity at the scale of the numbers being discussed.